Abstract

We report a heterodyne beat with a linewidth of 5.6±0.6 Hz between two cavity-stabilized quantum-cascade lasers operating at 8.5 µm. We also present a technique for measuring this beat that avoids the need for extreme isolation of the optical cavities from the environment, that of employing a third servo loop with low bandwidth to force one cavity to track the slow drifts and low-frequency fluctuations of the other. Although it is not fully independent, this technique greatly facilitates heterodyne beat measurements for evaluating the performance of cavity-locked lasers above the bandwidth of the third loop.

© 2002 Optical Society of America

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